*{
    margin: 0;
    padding: 0;
}
.content{
    width:320px;
    height: 480px;
    background: url("../img/game_bg.jpg");
    margin: 40px auto;
    position: relative;
}
.content>h1{
    color: #fff;
    position: absolute;
    top: 1px;
    left: 56px;
}
.content>.Progress{
    width: 180px;
    height: 16px;
    background: url("../img/progress.png");
    position: absolute;
    top: 66px;
    left: 63px;
}
.content>.btn{
    width: 150px;
    line-height: 35px;
    border-radius: 20px;
    border: 0;
    color: #fff;
    font-size: 20px;
    background: linear-gradient(#E55C3D,#C50000);
    position: absolute;
    bottom: 100px;
    left: 50%;
    text-align: center;
    transform: translateX(-50%);
    cursor: pointer;
    outline: none;
}
.content>.rules{
    width: 100%;
    height: 40px;
    background-color: #ccc;
    position: absolute;
    bottom: 0px;
    font-size: 18px;
    text-align: center;
    line-height: 40px;
    cursor: pointer;
}
.content>.rule{
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    position: absolute;
    top: 0px;
    left: 0px;
    padding-top: 100px;
    box-sizing: border-box;
    display: none;
}
.content>.rule>p{
    color: #fff;
    text-align: center;
    line-height: 50px;
}
.content>.rule>a{
    text-decoration: none;
    color: red;
   display: block;
   text-align: center;
   font-size:20px;
}

.content>.mask{
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    position: absolute;
    top: 0px;
    left: 0px;
    padding-top: 100px;
    box-sizing: border-box;
    display: none;
}
.content>.mask>h1{
    text-align: center;
    color: red;
    text-shadow: 2px 2px 0px #fff;
}
.content>.mask>h2{
    margin-top: 40px;
    text-align: center;
    color: #007DDC;
    text-shadow: 1px 1px 0px #fff;
}
.content>.mask>.goBack{
    width: 150px;
    line-height: 35px;
    border-radius: 20px;
    border: 0;
    color: #fff;
    background: linear-gradient(#74ACCF,#007DDC);
    left: 50%;
    text-align: center;
    position: absolute;
    transform: translateX(-50%);
    bottom: 160px;
    outline: none;
    cursor: pointer;

}
.content>.mask>.mask_btn{
    width: 150px;
    line-height: 35px;
    border-radius: 20px;
    border: 0;
    color: #fff;
    font-size: 20px;
    background: linear-gradient(#74ACCF,#007DDC);
    position: absolute;
    bottom: 100px;
    left: 50%;
    text-align: center;
    transform: translateX(-50%);
    cursor: pointer;
    outline: none;
}